Silencer construction



Dec. 6,' 1938.

F. E. DEREMER SILENCER CONSTRUCTION Filed March 16, 1936 (f lNgENTORi j 1 ATTORNEY.

Patented Dec. 6, 1938 UNITED STATES OFFIQE SILENCER CONSTRUCTION Floyd E. Deremer, Detroit, Mich.

Application March 16, 1936, Serial No. 69,101

1 Claim. (Cl. 18148) This application relates to silencer construe The silencer herein disclosed comprises an outtions. er casing it closed by end headers lll2 con- The silencer construction herein disclosed is nected by an innermost tube 14 having a plucharacterized by its beingathrough-passage type rality of perforations on its surface, many of 5 of silencer composed of three nested shells or which serve to communicate the interior of the tubes, the outer one of which ferms a casing, innermost tube with chambers l5 formed in the the innermost one of which forms the gas pasannular space between the innermost tube and sage tube, and the intermediate one of which an intermediate tube 16, which chambers are deforms an annular wall for high frequency sound fined by transverse diaphragms 11.

Wave attenuation chambers disposed in the an- It will be observed that the end of the inter- 1O nular space between the innermost tube and the mediate tube l6 adjacent the inlet end header intermediate tube, such space being compart- II is longitudinally spaced from such header to mented into attenuation chambers by transprovide a clear portion of the innermost tube, verse annular diaphragms. The silencer herewith the result that the perforations in such clear in disclosed is further characterized by the fact portion communicate the interior of the inner- 15 that the intermediate tube terminates short of most tube directly With the space surrounding the inlet end header of the silencer so that perthe intermediate tube. forations in the innermost tube between such Now having described the silencer construcend header and the adjacent end of the intertion herein indicated, reference will be had to mediate tube communicate the interior of the the claim which follows for a determination of 20 innermost tube directly with the space around the monopoly sought to be obtained herein. the intermediate tube. This feature contrasts the I claim: construction herein disclosed from the COllSlJlllC- In a silencer, an outer casing having end headtion disclosed in Fig. 6 of the Oldberg patent, ers, an inner tube passing through the headers 0- of September 1932, and in h and the interior of the silencer, an intermediate 25 o p t 1,933,973, 0f ce be tube surrounding only that part of the inlet 1933, where, because the intermediate tube eX tube remote from the headers, transverse diatends di ectly to the inlet end header, communiphragins in the annular space between the tubes cation from the inlet end of the innermost tube, dividing such space into annular chambers, the to the space surrounding the intermediate tube, inner tube having perforations therein between 30 must be established through openings of the inthe header and each end of the intermediate termediate tube. tube directly communicating the interior of the The Silencer he ein d closed m y be best uninner tube with the space surrounding the indelstood p reference to the app d W- termediate tube, and also having perforations ing. In this drawing, opening into the annular chambers. 35

Fig. 1 is an elevational section of a silencer of the invention; FLOYD E. DEREMER. 

